The US president, surrounded by his supporters, made the address during a speech at the White House on Thursday.
Global leaders formed a united front in criticising the decision with condemnation coming from Asia, Australia and Europe.
What is the effect of his decision? And what will it mean for our planet?
Presenter: Hazem Sika
Gina Loudon – former Trump campaign media surrogate and author
Michael Dorsey – director of the Sierra Club, the largest environmental organisation in the US
Damian Ryan – director of strategy at the Climate Group